Frank R Gossett

US Patent:

6771091, Aug 3, 2004

Filed:

Sep 24, 2002

Appl. No.:

10/253180

Inventors:

Jacek J. Lagowski - Tampa FL
Piotr Edelman - Tampa FL
Frank Gossett - Palm Harbor FL
Nick Kochey - St. Petersburg FL
Alexandre Savtchouk - Tampa FL

Assignee:

Semiconductor Diagnostics, Inc. - Tampa FL

International Classification:

G01R 3126

US Classification:

324765, 324750, 324767, 2504922

Abstract:

Techniques for measuring a contact potential difference of a sample at an elevated temperature using a probe designed for room temperature measurement are disclosed. In such measurements, probe damage by excessive heating can be prevented without any probe modifications to include probe cooling. This can be achieved by minimizing the time the probe spends in close proximity to the heated sample. Furthermore, the effect of probe heating by the sample on the probe reading can be corrected by including an additional contact potential difference measurement of a reference plate kept at room temperature in the measurement cycle.

US Patent:

54372410, Aug 1, 1995

Filed:

Aug 1, 1994

Appl. No.:

8/283557

Inventors:

Gary C. Rosenberg - Safety Harbor FL
Frank Gossett - Seminole FL

Assignee:

Pall Corporation - East Hills NY

International Classification:

G01L 1912

US Classification:

116268

Abstract:

A differential pressure indicator includes a housing having first and second pressure ports for fluid and a bore communicating with the pressure ports. A piston is movable in the bore between an actuated and an unactuated position in response to a pressure differential between the first and second pressure ports. A sensor senses movement of the piston between the actuated and the unactuated positions. A fluid control mechanism varies the effective surface area of the piston communicating with the first pressure port when the piston is in the unactuated position in accordance with variations in temperature of fluid at one of the pressure ports. The indicator is thereby prevented from actuating at low temperatures at which the fluid has a high viscosity.